David Lowe / Nucleo_Hello_Encoder

Hello World example for interfacing up to four rotary encoders to the STM32's timer/counter hardware, without interrupts.

Dependencies:   mbed-dev

Encoder/EncoderMspInitF0.cpp@0:ee5cb967aa17, 2015-01-10 (annotated)

Committer:
gregeric
Date:
Sat Jan 10 20:06:07 2015 +0000
Revision:
0:ee5cb967aa17
Child:
1:cd7b42c99ff8
Hello World example using the STM32's timer hardware interface, no interrupts.; ; Supporting Nucleo F030, F401, F411 (others can be added - L0xx included but untested).; ; Encoder with TIM4 not working on F411, OK on F401?

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gregeric 0:ee5cb967aa17 1 #include "mbed.h"
gregeric 0:ee5cb967aa17 2 /*
gregeric 0:ee5cb967aa17 3 * HAL_TIM_Encoder_MspInit()
gregeric 0:ee5cb967aa17 4 * Overrides the __weak function stub in stm32f4xx_hal_tim.h
gregeric 0:ee5cb967aa17 5 *
gregeric 0:ee5cb967aa17 6 * Edit the below for your preferred pin wiring & pullup/down
gregeric 0:ee5cb967aa17 7 * I have encoder common at 3V3, using GPIO_PULLDOWN on inputs.
gregeric 0:ee5cb967aa17 8 * Encoder A&B outputs connected directly to GPIOs.
gregeric 0:ee5cb967aa17 9 *
gregeric 0:ee5cb967aa17 10 * All Nucleos support encoders, from 030 up.
gregeric 0:ee5cb967aa17 11 * On 030, there's only TIM3 @ AF1 PA6 PA7 (D11 D12)
gregeric 0:ee5cb967aa17 12 */
gregeric 0:ee5cb967aa17 13
gregeric 0:ee5cb967aa17 14 #ifdef TARGET_STM32F0
gregeric 0:ee5cb967aa17 15 void HAL_TIM_Encoder_MspInit(TIM_HandleTypeDef *htim)
gregeric 0:ee5cb967aa17 16 {
gregeric 0:ee5cb967aa17 17 GPIO_InitTypeDef GPIO_InitStruct;
gregeric 0:ee5cb967aa17 18
gregeric 0:ee5cb967aa17 19 if (htim->Instance == TIM3) { //PA6 PA7 = Nucleo D12 D11
gregeric 0:ee5cb967aa17 20 __TIM3_CLK_ENABLE();
gregeric 0:ee5cb967aa17 21 __GPIOA_CLK_ENABLE();
gregeric 0:ee5cb967aa17 22 GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
gregeric 0:ee5cb967aa17 23 GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
gregeric 0:ee5cb967aa17 24 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
gregeric 0:ee5cb967aa17 25 GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
gregeric 0:ee5cb967aa17 26 GPIO_InitStruct.Alternate = GPIO_AF1_TIM3;
gregeric 0:ee5cb967aa17 27 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
gregeric 0:ee5cb967aa17 28 }
gregeric 0:ee5cb967aa17 29 }
gregeric 0:ee5cb967aa17 30 #endif